Apparatus for positioning a device

ABSTRACT

An apparatus for positioning a device. The apparatus includes a coupling member, a first arm, a second arm, and a sloped support member. The coupling member defines a first opening and a second opening. The first arm passes through the first opening, and the coupling member is movably connected to the first arm. The second arm passes through the second opening. The sloped support member is releasably connected to the second arm. The apparatus has at least five degrees of freedom.

CROSS REFERENCE TO RELATED APPLICATION

This application claims the priority benefit of U.S. Provisional PatentApplication No. 60/862,310, filed on Oct. 20, 2006.

BACKGROUND

This application discloses an invention that is related, generally andin various embodiments, to an apparatus for positioning a device.

In conventional surgery, surgical devices are often supported by thehands of one or more surgeons or assistants positioned proximate apatient. For applications involving robotic surgery, surgical devicesare generally supported by one or more robotic arms. In many cases, thenumber, size and positioning of such robotic arms tend to interfere withthe desired movements of the surgeons and/or assistants proximate apatient.

SUMMARY

In one general respect, this application discloses an apparatus forpositioning a device. According to various embodiments, the apparatusincludes a coupling member, a first arm, a second arm, and a slopedsupport member. The coupling member defines a first opening and a secondopening. The first arm passes through the first opening, and thecoupling member is movably connected to the first arm. The second armpasses through the second opening. The sloped support member isreleasably connected to the second arm. The apparatus has at least fivedegrees of freedom.

DESCRIPTION OF DRAWINGS

Various embodiments of the invention are described herein by way ofexample in conjunction with the following figures.

FIGS. 1A and 1B illustrate various embodiments of a steerablemulti-linked device;

FIG. 2 illustrates various embodiments of a core mechanism of the deviceof FIGS. 1A and 1B;

FIGS. 3A-3C illustrate various embodiments of a proximal link of thecore mechanism;

FIGS. 4A-4C illustrate various embodiments of an intermediate link ofthe core mechanism;

FIGS. 5A-5C illustrate various embodiments of a distal link of the coremechanism;

FIG. 6 illustrates various embodiments of a sleeve mechanism of thedevice of FIGS. 1A and 1B;

FIGS. 7A-7C illustrate various embodiments of a proximal link of thesleeve mechanism;

FIGS. 8A-8C illustrate various embodiments of an intermediate link ofthe sleeve mechanism;

FIGS. 9A-9D illustrate various embodiments of a distal link of thesleeve mechanism;

FIG. 10 illustrates various embodiments of a motion sequence of thedevice of FIGS. 1A and 1B;

FIG. 11 illustrates various embodiments of a steerable multi-linkeddevice traversing a path having tight curvatures;

FIG. 12 illustrates various embodiments of an apparatus for positioninga device;

FIGS. 13A-13E illustrate various embodiments of an apparatus forpositioning a device;

FIGS. 14A and 14B illustrate various embodiments of a fixed portion anda movable portion of an arm of the apparatus of FIGS. 13A-13E;

FIG. 15 illustrates various embodiments of a ball, a socket and a slopedsupport member of the apparatus of FIGS. 13A-13E; and

FIG. 16 illustrates various embodiments of a bushing and a couplingmember of the apparatus of FIGS. 13A-13E.

DETAILED DESCRIPTION

It is to be understood that at least some of the figures anddescriptions of the invention have been simplified to focus on elementsthat are relevant for a clear understanding of the invention, whileeliminating, for purposes of clarity, other elements that those ofordinary skill in the art will appreciate may also comprise a portion ofthe invention. However, because such elements are well known in the art,and because they do not necessarily facilitate a better understanding ofthe invention, a description of such elements is not provided herein.

According to various embodiments, the apparatus may be utilized toposition a variety of different devices. For example, the apparatus maybe utilized to position a device such as a feeder that may be utilizedto insert or extract a multi-linked device into or from a patient. Forease of explanation purposes, the apparatus will be described in thecontext of its use with a feeder and various embodiments of thesteerable multi-linked device described in FIGS. 1-11. However, oneskilled in the art will appreciate that the apparatus may be utilized toposition other types of devices.

FIGS. 1A and 1B illustrate various embodiments of a steerablemulti-linked device 10. Various embodiments of the device 10 may beutilized for medical procedures (e.g., minimally invasive procedures),for surveillance applications, for inspection applications, for searchand rescue applications, etc. For purposes of clarity only, the utilityof the device 10 will be described hereinbelow in the context of itsapplicability to medical procedures. However, a person skilled in theart will appreciate that the device 10 can be utilized in a variety ofdifferent applications.

The device 10 includes a first mechanism 12 and a second mechanism 14.According to various embodiments, the second mechanism 14 is structuredand arranged to receive and surround the first mechanism 12 as shown inFIG. 1B. For such embodiments, the first mechanism 12 may be consideredthe inner mechanism or the core mechanism, and the second mechanism 14may be considered the outer mechanism or the sleeve mechanism. Accordingto other embodiments, the first and second mechanisms 12, 14 may bestructured and arranged to have a relationship other than a concentricrelationship. For example, one skilled in the art will appreciate that,according to various embodiments, the first and second mechanisms 12, 14may be structured and arranged to operate in a side-by-side arrangement,where the first mechanism 12 operates adjacent to the second mechanism14. As described in more detail hereinbelow, the first mechanism 12 mayoperate in either a rigid mode or a limp mode, the second mechanism 14may operate in either a rigid mode or a limp mode, and the first andsecond mechanisms 12, 14 may operate independent of one another. Boththe first mechanism 12 and the second mechanism 14 may be steerablemechanisms. Accordingly, it will be appreciated that the device 10 maybe utilized to navigate a luminal space as well as any three-dimensionalpath within an intracavity space. The device 10 may also comprise afirst cable 16, a second cable 18, a third cable 20, and a fourth cable22. The first, second and third cables 16, 18, 20 may be consideredsteering cables, and the fourth cable 22 may be considered a tensioningcable.

FIG. 2 illustrates various embodiments of the first mechanism 12 of thedevice 10. The first mechanism 12 is a multi-linked mechanism andincludes a first end 24 and a second end 26. The first end 24 may beconsidered the proximal end and the second end 26 may be considered thedistal end. The first mechanism 12 includes a first link 28, a secondlink 30, and any number of intermediate links 32 between the first andsecond links 28, 30. The first link 28 may be considered the proximallink, and the second link 30 may be considered the distal link.

FIGS. 3A-3C illustrate various embodiments of the first link 28 (innerproximal link) of the first mechanism 12. The first link 28 includes afirst end 34 and a second end 36, and defines a longitudinal axis 38that passes through the center of the first end 34 and the center of thesecond end 36 as shown in FIG. 3B. The first link 28 may be fabricatedfrom any suitable material. According to various embodiments, the firstlink 28 is fabricated from a fiber reinforced material such as, forexample, G10/FR4 Garolite®. The first link 28 has a generallycylindrical shaped exterior and is described in more detail hereinbelow.

The first link 28 includes a first portion 40 and a second portion 42.The first portion 40 may be considered the proximal portion and thesecond portion 42 may be considered the distal portion. The firstportion 40 may be fabricated integral with the second portion 42. Thefirst portion 40 has a cylindrical shaped exterior, and extends from thefirst end 34 of the first link 28 toward the second end 36 of the firstlink 28. According to various embodiments, the diameter of the firstportion 40 is on the order of approximately 6.35 millimeters.

The second portion 42 has a generally cylindrically shaped exterior. Thesecond portion 42 has a cylindrically shaped exterior where it contactsthe first portion 40, and tapers toward the second end 36 of the firstlink 28. The second portion 42 may be shaped in the form of a generallysegmented hemisphere at the second end 36 of the first link 28.According to various embodiments, the diameter of the second portion 42is on the order of approximately 4.75 millimeters where it contacts thefirst portion 40.

The second portion 42 includes a first surface 44. The first surface 44may be considered the outer surface of the second portion 42. The secondportion 42 defines a first groove 46 parallel to the longitudinal axis38 along the first surface 44, a second groove 48 parallel to thelongitudinal axis 38 along the first surface 44, and a third groove 50parallel to the longitudinal axis 38 along the first surface 44. Each ofthe first, second and third grooves 46, 48, 50 extend along the firstsurface 44 toward the second end 36 of the first link 28. The first,second and third grooves 46, 48, 50 may be semi-tubular shaped and maybe evenly spaced about the first surface 44 of the second portion 42 ofthe first link 28 as shown in FIG. 3C. According to various embodiments,the first, second, and third grooves 46, 48, 50 may be configured in theshape of a segmented cylinder. The size of each of the grooves 46, 48,50 may identical to one another or may be different from one another.For example, according to various embodiments, the first and secondgrooves 46, 48 are configured as segments of a cylinder having adiameter on the order of approximately 1.25 millimeters, and the thirdgroove 50 is configured as a segment of a cylinder having a diameter onthe order of approximately 2.50 millimeters. The length of the firstlink 28 may be on the order of approximately 65 millimeters. However,one skilled in the art will appreciate that the length of the first link28 can vary based on the application.

The first link 28 also defines a passage 52 extending from the first end34 to the second end 36 along the longitudinal axis 38 as shown in FIG.3B. The passage 52 is of a size sufficient to allow the fourth cable 22to pass therethrough. According to various embodiments, the passage 52is generally configured as a complex shape that includes a combinationof a first cylinder 54 that extends from the first end 34 toward thesecond end 36, and a second cylinder 56 that extends from the firstcylinder 54 toward the second end 36. The diameter of the first cylinder54 is larger than the diameter of the second cylinder 56. For example,according to various embodiments, the first cylinder 54 has a diameteron the order of approximately 3.20 millimeters and the second cylinder56 has a diameter on the order of approximately 1.50 millimeters.

FIGS. 4A-4C illustrate various embodiments of one of the intermediatelinks 32 (inner intermediate link) of the first mechanism 12. Theintermediate link 32 is representative of the other intermediate links32. The intermediate link 32 includes a first end 58 and a second end60, and defines a longitudinal axis 62 that passes through the center ofthe first end 58 and the center of the second end 60 as shown in FIG.4B. The intermediate link 32 may be fabricated from any suitablematerial. According to various embodiments, the intermediate link 32 isfabricated from a fiber reinforced material such as, for example,G10/FR4 Garolite®. The intermediate link 32 has a generallybullet-shaped exterior and is described in more detail hereinbelow.

The intermediate link 32 includes a first portion 64 and a secondportion 66. The first portion 64 may be considered the proximal portionand the second portion 66 may be considered the distal portion. Thefirst portion 64 may be fabricated integral with the second portion 66.The first portion 64 has a generally cylindrical shaped exterior, andextends from the first end 58 of the intermediate link 32 toward thesecond end 60 of the intermediate link 32. According to variousembodiments, the second portion 66 has a generally cylindrically shapedexterior where it contacts the first portion 64, and tapers toward thesecond end 60 of the intermediate link 32. The exterior of the secondportion 66 is configured in the form of a generally segmentedhemisphere. According to various embodiments, the diameter of theintermediate link 32 is on the order of approximately 4.75 millimetersat the first end 58 thereof. The length of the intermediate link 32 maybe on the order of approximately 5.85 millimeters. However, one skilledin the art will appreciate that the length of the intermediate link 32can vary based on the application.

The intermediate link 32 also includes a first surface 68 that extendsfrom the first end 58 of the intermediate link 32 to the second end 60of the intermediate link 32. The first surface 68 may be considered theouter surface of the intermediate link 32. The intermediate link 32 alsodefines a first groove 70 parallel to the longitudinal axis 62 along thefirst surface 68, a second groove 72 parallel to the longitudinal axis62 along the first surface 68, and a third groove 74 parallel to thelongitudinal axis 62 along the first surface 68. Each of the first,second and third grooves 70, 72, 74 extend along the first surface 68from the first end 58 of the intermediate link 32 toward the second end60 of the intermediate link 32. The first, second and third grooves 70,72, 74 may be semi-tubular shaped and may be evenly spaced about thefirst surface 68 of the intermediate link 32 as shown in FIG. 4C.According to various embodiments, the first, second, and third grooves70, 72, 74 may be configured in the shape of a segmented cylinder. Thesize of each of the grooves 70, 72, 74 may identical to one another ormay be different from one another. For example, according to variousembodiments, the first and second grooves 70, 72 are configured assegments of a cylinder having a diameter on the order of approximately1.75 millimeters at the first end 58 of the intermediate link 32, andthe third groove 74 is configured as a segment of a cylinder having adiameter on the order of approximately 2.50 millimeters at the first end58 of the intermediate link 32. The first, second and third grooves 70,72, 74 are each configured to receive and partially surround any of avariety of tools or instruments (e.g., ablation tools) which may passfrom the first end 24 of the multi-linked device 10 to the second end 26of the multi-linked device 10.

The intermediate link 32 also defines a passage 76 extending from thefirst end 58 to the second end 60 along the longitudinal axis 62 asshown in FIG. 4B. The passage 76 is of a size sufficient to allow thefourth cable 22 to pass therethrough. According to various embodiments,the passage 76 is generally configured as a complex shape that includesa combination of a first segmented hemisphere 78 that extends from thefirst end 58 toward the second end 60, a second segmented hemisphere 80that extends from the first segmented hemisphere 78 toward the secondend 60, a cylinder 82 that extends from the second segmented hemisphere80 toward the second end 60, and a third segmented hemisphere 84 thatextends from the cylinder 82 to the second end 60 of the intermediatelink 32. According to various embodiments, the first segmentedhemisphere 78 represents a portion of a sphere having a diameter on theorder of approximately 4.75 millimeters, the second segmented hemisphere80 represents a portion of a sphere having a diameter on the order ofapproximately 2.25 millimeters, the cylinder 82 has a diameter on theorder of approximately 1.0 millimeter, and the third segmentedhemisphere 84 represents a portion of a sphere having a diameter on theorder of approximately 2.25 millimeters.

The first segmented hemisphere 78 of the passage 76 is configured toreceive the second end 36 of the first link 28 when the first link 28 iscoupled to the intermediate link 32. Similarly, for a given intermediatelink 32, the first segmented hemisphere 78 of the passage 76 isconfigured to receive the second end 60 of another intermediate link 32when the other intermediate link 32 is coupled to the given intermediatelink 32. The third segmented hemisphere 84 may serve to reduce thepinching or binding of the fourth cable 22 when one intermediate link 32moves relative to an adjacent intermediate link 32 coupled thereto.Similarly, when the second link 30 is coupled to a given intermediatelink 32, the third segmented hemisphere 84 may serve to reduce thepinching or binding of the fourth cable 22 when the second link 30 movesrelative to the given intermediate link 32.

With the above described structure, the first link 28 may be coupled tothe intermediate link 32 by seating the second end 36 of the first link28 in the first segmented hemisphere 78 of the passage 76 of theintermediate link 32. As the convex configuration of the second end 36of the first link 28 generally corresponds with the concaveconfiguration of the first segmented hemisphere 78 of the passage 76 ofthe intermediate link 32, the first link 28 may be coupled to theintermediate link 32 such that the longitudinal axis 38 and the first,second and third grooves 46, 48, 50 of the first link 28 arerespectively aligned with the longitudinal axis 62 and the first, secondand third grooves 70, 72, 74 of the intermediate link 32. Theintermediate link 32 may be moved relative to the first link 28 suchthat the longitudinal axis 62 of the intermediate link 32 is not alignedwith the longitudinal axis 38 of the first link 28. According to variousembodiments, the configuration of the first link 28 and the intermediatelink 32 allows for the intermediate link 32 to be moved relative to thefirst link 28 coupled thereto such that the longitudinal axis 38 of thefirst link 28 and the longitudinal axis 62 of the intermediate link 32are up to approximately 25° out of alignment with one another.Similarly, one intermediate link 32 may be coupled to anotherintermediate link 32, and so on, by seating the second end 60 of oneintermediate link 32 in the first segmented hemisphere 78 of the passage76 of another intermediate link 32. As the convex configuration of thesecond end 60 of the intermediate link 32 generally corresponds with theconcave configuration of the first segmented hemisphere 78 of thepassage 76 of the intermediate link 32, the intermediate links 32 may becoupled such that the respective longitudinal axes 62 and the respectivefirst, second and third grooves 46, 48, 50 of the intermediate links 32are aligned. The coupled intermediate links 32 may be moved relative toone another such that the respective longitudinal axes 62 of the coupledintermediate links 32 are not aligned. According to various embodiments,the configuration of the coupled intermediate links 32 allows for oneintermediate link 32 to be moved relative to an adjacent intermediatelink 32 coupled thereto such that the respective longitudinal axes 62are up to approximately 25° out of alignment with one another.

FIGS. 5A-5C illustrate various embodiments of the second link 30 (innerdistal link) of the first mechanism 12. The second link 30 includes afirst end 86 and a second end 88, and defines a longitudinal axis 90that passes through the center of the first end 86 and the center of thesecond end 88 as shown in FIG. 5B. The second link 30 may be fabricatedfrom any suitable material. According to various embodiments, the secondlink 30 is fabricated from a thermoplastic material such as, forexample, Delrin®.

The second link 30 includes a first portion 92 and a second portion 94.The first portion 92 may be considered the proximal portion and thesecond portion 94 may be considered the distal portion. The firstportion 92 may be fabricated integral with the second portion 94. Thefirst portion 92 has a generally cylindrical shaped exterior, andextends from the first end 86 of the second link 30 toward the secondend 88 of the second link 30. According to various embodiments, thesecond portion 94 has a generally cylindrically shaped exterior where itcontacts the first portion 92, and tapers toward the second end 88 ofthe second link 30. The exterior of the second portion 64 is configuredin the form of a generally segmented cone. According to variousembodiments, the diameter of the second link 30 is on the order ofapproximately 4.75 millimeters at the first end 86 thereof, and thetaper of the second portion 94 is at an angle of approximately 30°relative to the exterior of the first portion 92. The length of thesecond link 30 may be on the order of approximately 5.90 millimeters.However, one skilled in the art will appreciate that the length of thesecond link 30 can vary based on the application.

The second link 30 also includes a first surface 96 that extends fromthe first end 86 of the second link 30 to the second end 88 of thesecond link 30. The first surface 96 may be considered the outer surfaceof the second link 30. The second link 30 also defines a first groove 98parallel to the longitudinal axis 90 along the first surface 96, asecond groove 100 parallel to the longitudinal axis 90 along the firstsurface 96, and a third groove 102 parallel to the longitudinal axis 90along the first surface 96. Each of the first, second and third grooves98, 100, 102 extend along the first surface 96 from the first end 86 ofthe second link 30 toward the second end 88 of the second link 30. Thefirst, second and third grooves 98, 100, 102 may be semi-tubular shapedand may be evenly spaced about the first surface 96 of the second link30 as shown in FIG. 5C. According to various embodiments, the first,second, and third grooves 98, 100, 102 may be configured in the shape ofa segmented cylinder. The size of each of the grooves 98, 100, 102 mayidentical to one another or may be different from one another. Forexample, according to various embodiments, the first and second grooves98, 100 are configured as segments of a cylinder having a diameter onthe order of approximately 1.25 millimeters at the first end 86 of thesecond link 30, and the third groove 102 is configured as a segment of acylinder having a diameter on the order of approximately 2.50millimeters at the first end 86 of the second link 30. The first, secondand third grooves 98, 100, 102 are each configured to receive andpartially surround any of a variety of tools or instruments (e.g.,ablation tools) which may pass from the first end 24 of the multi-linkeddevice 10 to the second end 26 of the multi-linked device 10.

The second link 30 also defines a passage 104 extending from the firstend 86 to the second end 88 along the longitudinal axis 90 as shown inFIG. 5B. The passage 104 is of a size sufficient to allow the fourthcable 22 to pass therethrough. According to various embodiments, thepassage 104 is generally configured as a complex shape that includes acombination of a first segmented hemisphere 106 that extends from thefirst end 86 toward the second end 88, a second segmented hemisphere 108that extends from the first segmented hemisphere 106 toward the secondend 88, and a cylinder 110 that extends from the second segmentedhemisphere 108 to the second end 88 of the second link 30. According tovarious embodiments, the first segmented hemisphere 106 represents aportion of a sphere having a diameter on the order of approximately 4.75millimeters, the second segmented hemisphere 108 represents a portion ofa sphere having a diameter on the order of approximately 2.50millimeters, and the cylinder 110 has a diameter on the order ofapproximately 1.0 millimeter. The first segmented hemisphere 106 of thepassage 104 is configured to receive the second end 60 of anintermediate link 32 when the intermediate link 32 is coupled to thesecond link 30.

With the above described structure, an intermediate link 32 may becoupled to the second link 30 by seating the second end 60 of theintermediate link 32 in the first segmented hemisphere 106 of thepassage 104 of the second link 30. As the convex configuration of thesecond end 60 of the intermediate link 32 generally corresponds with theconcave configuration of the first segmented hemisphere 106 of thepassage 104 of the second link 30, the intermediate link 32 may becoupled to the second link 30 such that the longitudinal axis 62 and thefirst, second and third grooves 70, 72, 74 of the intermediate link 32are respectively aligned with the longitudinal axis 90 and the first,second and third grooves 98, 100, 102 of the second link 30. The secondlink 30 may be moved relative to the intermediate link 32 coupledthereto such that the respective longitudinal axes 62, 90 are notaligned. According to various embodiments, the configuration of thesecond link 30 allows for an intermediate link 32 coupled thereto to bemoved relative to the second link 30 such that the respectivelongitudinal axes 62, 90 are up to approximately 25° out of alignmentwith one another.

FIG. 6 illustrates various embodiments of the second mechanism 14 of thedevice 10. The second mechanism 14 is a multi-linked mechanism andincludes a first end 120 and a second end 122. The first end 120 may beconsidered the proximal end and the second end 122 may be considered thedistal end. The second mechanism 14 includes a first link 124, a secondlink 126, and any number of intermediate links 128 between the first andsecond links 124, 126. The first link 124 may be considered the proximallink, and the second link 126 may be considered the distal link.

FIGS. 7A-7C illustrate various embodiments of the first link 124 (outerproximal link) of the second mechanism 14. The first link 124 includes afirst end 130 and a second end 132, and defines a longitudinal axis 134that passes through the center of the first end 130 and the center ofthe second end 132 as shown in FIG. 7B. The first link 124 may befabricated from any suitable material. According to various embodiments,the first link 124 is fabricated from a stainless steel material suchas, for example, 316 stainless steel. The first link 124 has a generallybullet-shaped exterior and is described in more detail hereinbelow.

The first link 124 includes a first portion 136 and a second portion138. The first portion 136 may be considered the proximal portion andthe second portion 138 may be considered the distal portion. The firstportion 136 may be fabricated integral with the second portion 138. Thefirst portion 136 has a cylindrical shaped exterior, and extends fromthe first end 130 of the first link 124 toward the second end 132 of thefirst link 124. According to various embodiments, the diameter of thefirst portion 136 is on the order of approximately 12.70 millimeters.

The second portion 138 has a generally cylindrically shaped exterior.The second portion 138 has a cylindrically shaped exterior where itcontacts the first portion 136, and tapers toward the second end 132 ofthe first link 124. The second portion 138 may be shaped in the form ofa generally segmented hemisphere at the second end 132 of the first link124. According to various embodiments, the diameter of the secondportion 138 is on the order of approximately 9.50 millimeters where itcontacts the first portion 136.

The second portion 138 includes a first surface 140. The first surface140 may be considered the outer surface of the second portion 138. Thesecond portion 138 defines a first groove 142 along the first surface140, a second groove 144 along the first surface 140, and a third groove146 along the first surface 140. Each of the first, second and thirdgrooves 142, 144, 146 are oblique relative to the longitudinal axis 134and extend along the first surface 140 toward the second end 132 of thefirst link 124. According to various embodiments, each of the grooves142, 144, 146 are oriented at an angle on the order of approximately 15°relative to the longitudinal axis 134. As shown in FIG. 7C, the first,second and third grooves 142, 144, 146 may be evenly spaced about thefirst surface 140 of the first link 124. According to variousembodiments, the first, second, and third grooves 142, 144, 146 may beconfigured in the shape of a segmented cylinder. The size of each of thegrooves 142, 144, 146 may identical to one another or may be differentfrom one another. For example, according to various embodiments, each ofthe grooves 142, 144, 146 are configured as segments of respectivecylinders having diameters on the order of approximately 3.0millimeters. The first, second and third grooves 142, 144, 146 are eachconfigured to facilitate the introduction various tools or instruments(e.g., ablation tools) into the multi-linked device 10. The length ofthe first link 124 may be on the order of approximately 18.5millimeters. However, one skilled in the art will appreciate that thelength of the first link 124 can vary based on the application.

The first link 124 also defines a passage 148 extending from the firstend 130 to the second end 132 along the longitudinal axis 134 as shownin FIG. 7B. The passage 148 is of a size sufficient to allow the firstmechanism 12 to pass therethrough. According to various embodiments, thepassage 148 is generally configured as a complex shape that includes acombination of a segmented cone 150 that extends from the first end 130toward the second end 132, and a cylinder 152 that extends from thesegmented cone 150 to the second end 132 of the first link 124.According to various embodiments, the segmented cone 150 has a diameteron the order of approximately 7.0 millimeters at the first end 130 ofthe first link 124, and is tapered at an angle on the order ofapproximately 45° relative to the longitudinal axis 134. The cylinder152 has a diameter on the order of approximately 5.50 millimeters.

The first link 124 also defines a first through-hole 154, a secondthrough-hole 156, and a third through-hole 158. (See FIG. 7C). The firstthrough-hole 154 is substantially parallel to the longitudinal axis 134,extends from the first portion 136 toward the second end 132, and ispositioned between the passage 148 and the first surface 140. The secondthrough-hole 156 is substantially parallel to the longitudinal axis 134,extends from the first portion 136 to the second end 132, and ispositioned between the passage 148 and the first surface 140. The thirdthrough-hole 158 is substantially parallel to the longitudinal axis 134,extends from the first portion 136 to the second end 132, and ispositioned between the passage 148 and the first surface 140. The first,second and third through-holes 154, 156, 158 are generally cylindricallyshaped. According to various embodiments, the through-holes 154, 156,158 are evenly spaced from one another as shown in FIG. 7C. The size ofeach of the through-holes 154, 156, 158 may be identical to one anotheror may be different from one another. For example, according to variousembodiments, the respective diameters associated with the through-holes154, 156, 158 may each be on the order of approximately 1.20millimeters. The first through-hole 154 is configured to receive andsurround the first cable 16. The second through-hole 156 is configuredto receive and surround the second cable 18. The third through-hole 158is configured to receive and surround the third cable 20. The first,second and third through-holes 154, 156, 158 may serve as guidepaths formovement of the first, second and third cables 16, 18, 20.

FIGS. 8A-8C illustrate various embodiments of one of the intermediatelinks 128 (outer intermediate link) of the second mechanism 14. Theintermediate link 128 is representative of the other intermediate links128. The intermediate link 128 includes a first end 160 and a second end162, and defines a longitudinal axis 164 that passes through the centerof the first end 160 and the center of the second end 162 as shown inFIG. 8B. The intermediate link 128 may be fabricated from any suitablematerial. According to various embodiments, the intermediate link 128 isfabricated from a polymer thermosplastic material such as, for example,polysulfone. The intermediate link 128 has a generally bullet-shapedexterior and is described in more detail hereinbelow.

The intermediate link 128 includes a first portion 166 and a secondportion 168. The first portion 166 may be considered the proximalportion and the second portion 168 may be considered the distal portion.The first portion 166 may be fabricated integral with the second portion168. The first portion 166 has a generally cylindrical shaped exterior,and extends from the first end 160 of the intermediate link 128 towardthe second end 162 of the intermediate link 128. According to variousembodiments, the second portion 168 has a generally cylindrically shapedexterior where it contacts the first portion 166, and tapers toward thesecond end 162 of the intermediate link 128. The exterior of the secondportion 168 is configured in the form of a generally segmentedhemisphere. According to various embodiments, the diameter of theintermediate link 128 is on the order of approximately 9.65 millimetersat the first end 160 thereof. The length of the intermediate link 128may be on the order of approximately 8.40 millimeters. However, oneskilled in the art will appreciate that the length of the intermediatelink 128 can vary based on the application.

The intermediate link 128 also includes a first surface 170 that extendsfrom the first end 160 of the intermediate link 128 to the second end162 of the intermediate link 128, and a second surface 170 that extendsfrom the first end 160 of the intermediate link 128 to the second end162 of the intermediate link 128. The first surface 170 may beconsidered the outer surface of the intermediate link 128, and thesecond surface 172 may be considered the inner surface of theintermediate link 128. The intermediate link 32 also defines a firstgroove 174 substantially parallel to the longitudinal axis 164 along thesecond surface 172, a second groove 176 substantially parallel to thelongitudinal axis 164 along the second surface 172, and a third groove178 substantially parallel to the longitudinal axis 164 along the secondsurface 172. Each of the first, second and third grooves 174, 176, 178extend along the second surface 172 toward the second end 162 of theintermediate link 128. The first, second and third grooves 174, 176, 178may be semi-tubular shaped and may be evenly spaced about the secondsurface 172 of the intermediate link 128 as shown in FIG. 8C. Accordingto various embodiments, the first, second, and third grooves 174, 176,178 may be configured in the shape of a segmented cylinder. The size ofeach of the grooves 174, 176, 178 may identical to one another or may bedifferent from one another. For example, according to variousembodiments, the first and second grooves 174, 176 are configured assegments of cylinders having diameters on the order of approximately1.75 millimeters at the first end 160 of the intermediate link 128, andthe third groove 178 is configured as a segment of a cylinder having adiameter on the order of approximately 2.50 millimeters at the first end160 of the intermediate link 128. The first, second and third grooves174, 176, 178 are each configured to receive and partially surround anyof a variety of tools or instruments (e.g., ablation tools) which maypass from the first end 24 of the multi-linked device 10 to the secondend 26 of the multi-linked device 10.

The intermediate link 128 also defines a passage 180 extending from thefirst end 160 to the second end 162 along the longitudinal axis 164 asshown in FIG. 8B. The passage 180 is of a size sufficient to allow thefirst mechanism 12 to pass therethrough. According to variousembodiments, the passage 180 is generally configured as a complex shapethat includes a combination of a segmented hemisphere 182 that extendsfrom the first end 160 toward the second end 162, a first segmented cone184 that extends from the segmented hemisphere 182 toward the second end162, a cylinder 186 that extends from the first segmented cone 184toward the second end 162, and a second segmented cone 188 that extendsfrom the cylinder 186 to the second end 162 of the intermediate link128. According to various embodiments, the segmented hemisphere 182represents a portion of a sphere having a diameter on the order ofapproximately 9.65 millimeters, the first segmented cone 184 is taperedat an angle on the order of approximately 15° relative to thelongitudinal axis 164, the cylinder 186 has a diameter on the order ofapproximately 5.50 millimeters, and the second segmented cone 188 istapered at an angle on the order of approximately 15° relative to thelongitudinal axis 164. The segmented hemisphere 182 of the passage 180is configured to receive the second end 132 of the first link 124 whenthe first link 124 is coupled to the intermediate link 128. Similarly,for a given intermediate link 128, the segmented hemisphere 182 of thepassage 180 is configured to receive the second end 162 of anotherintermediate link 128 when the other intermediate link 128 is coupled tothe given intermediate link 128.

The intermediate link 128 also defines a first through-hole 190, asecond through-hole 192, and a third through-hole 194. (See FIG. 8C).The first through-hole 190 is substantially parallel to the longitudinalaxis 164, extends from the first portion 166 toward the second end 162,and is positioned between the passage 180 and the first surface 170. Thesecond through-hole 192 is substantially parallel to the longitudinalaxis 164, extends from the first portion 166 to the second end 162, andis positioned between the passage 180 and the first surface 170. Thethird through-hole 194 is substantially parallel to the longitudinalaxis 164, extends from the first portion 166 to the second end 162, andis positioned between the passage 180 and the first surface 170. Thefirst, second and third through-holes 190, 192, 194 are generallycylindrically shaped. According to various embodiments, thethrough-holes 190, 192, 194 are evenly spaced from one another. The sizeof each of the through-holes 190, 192, 194 may be identical to oneanother or may be different from one another. For example, according tovarious embodiments, the respective diameters associated with thethrough-holes 190, 192, 194 may each be on the order of approximately1.25 millimeters. The first through-hole 190 is configured to receiveand surround the first cable 16. The second through-hole 192 isconfigured to receive and surround the second cable 18. The thirdthrough-hole 194 is configured to receive and surround the third cable20. The first, second and third through-holes 190, 192, 194 may serve asguidepaths for movement of the first, second and third cables 16, 18,20.

As shown in FIG. 8C, the intermediate link 128 also defines first,second and third indents 196, 198, 200 at the second end 162 thereofresulting, in part, from the combination of the taper associated withthe second portion 168 and the configuration and orientation of thefirst, second, and third grooves 174, 176, 178. The first, second andthird indents 196, 198, 200 may be evenly spaced about the second end162 of the intermediate link 128 as shown in FIG. 8C. The first, secondand third indents 196, 198, 200 may serve to reduce the pinching orbinding of various tools or instruments (e.g., ablation tools) when oneintermediate link 128 of the second mechanism 14 is moved relative toanother intermediate link 128 coupled thereto.

The intermediate link 128 also defines fourth, fifth and sixth indents202, 204, 206 at the second end 162 thereof resulting from thecombination of the taper associated with the second portion 168 and theconfiguration and orientation of the first, second, and thirdthrough-holes 190, 192, 194. The fourth fifth and sixth indents 202,204, 206 may be evenly spaced about the second end 162 of theintermediate link 128, and may be evenly spaced from the first, secondand third indents 196, 198, 200 as shown in FIG. 8C. The fourth, fifthand sixth indents 202, 204, 206 may serve to reduce the pinching orbinding of the first, second and third cables 16, 18, 20 when oneintermediate link 198 of the second mechanism 14 is moved relative toanother intermediate link 128 coupled thereto.

According to various embodiments, an intermediate link 128 may alsodefine an opening (not shown) that extends from the second surface 172or from one of the grooves 174, 176, 178 to the first surface 170 of theintermediate link 128. The intermediate link 128 may have any number ofsuch openings, and any number of the intermediate links 128 may havesuch openings. The opening may be utilized as an exit point for a toolor instrument which may pass from the first end 24 of the multi-linkeddevice 10 toward the second end 26 of the multi-linked device 10. Forsuch embodiments, the respective intermediate link 128 may be positionedproximate the second link 126 of the second mechanism 14. The openingmay be oriented at any angle relative to the longitudinal axis 134 ofthe intermediate link 128. When the first mechanism 12 is removed fromthe second mechanism 14, and a relatively large tool or instrument isadvanced from the first end 120 of the second mechanism 14 to the secondend 122 of the second mechanism 14, sufficient room may not exist for asecond tool or instrument (e.g., fiber optic cable) to pass through thesecond end 122 of the second mechanism 14. For such instances, thesecond tool or instrument may exit through an opening of one of theintermediate links 128.

With the above described structure, the first link 124 may be coupled tothe intermediate link 128 by seating the second end 132 of the firstlink 124 in the segmented hemisphere 182 of the passage 180 of theintermediate link 128. As the convex configuration of the second end 132of the first link 124 generally corresponds with the concaveconfiguration of the segmented hemisphere 182 of the passage 180 of theintermediate link 128, the first link 124 may be coupled to theintermediate link 128 such that the longitudinal axis 134, the first,second and third grooves 142, 144, 146, and the first, second and thirdthrough-holes 154, 156, 158 of the first link 124 are respectivelyaligned with the longitudinal axis 164, the first, second and thirdgrooves 174, 176, 178, and the first, second and third through-holes190, 192, 194 of the intermediate link 128. The intermediate link 128may be moved relative to the first link 124 such that the longitudinalaxis 164 of the intermediate link 128 is not aligned with thelongitudinal axis 134 of the first link 124. According to variousembodiments, the configuration of the first link 124 and theintermediate link 128 allows for the intermediate link 128 to be movedrelative to the first link 124 coupled thereto such that thelongitudinal axis 134 of the first link 124 and the longitudinal axis164 of the intermediate link 128 are up to approximately 100 out ofalignment with one another. Similarly, one intermediate link 128 may becoupled to another intermediate link 128, and so on, by seating thesecond end 162 of one intermediate link 128 in the segmented hemisphere182 of the passage 180 of another intermediate link 128. As the convexconfiguration of the second end 162 of the intermediate link 128generally corresponds with the concave configuration of the segmentedhemisphere 182 of the passage 180 of the intermediate link 128, theintermediate links 128 may be coupled such that the respectivelongitudinal axes 164, the respective first, second and third grooves174, 176, 178, and the respective first, second and third through-holes190, 192, 194 of the intermediate links 128 are aligned. The coupledintermediate links 128 may be moved relative to one another such thatthe respective longitudinal axes 164 of the coupled intermediate links128 are not aligned. According to various embodiments, the configurationof the coupled intermediate links 128 allows for one intermediate link128 to be moved relative to another intermediate link 128 coupledthereto such that the respective longitudinal axes 164 are up toapproximately 10° out of alignment with one another.

FIGS. 9A-9D illustrate various embodiments of the second link 126 (outerdistal link) of the second mechanism 14. The second link 126 includes afirst end 208 and a second end 210, and defines a longitudinal axis 212that passes through the center of the first end 208 and the center ofthe second end 210 as shown in FIG. 9C. The second link 126 may befabricated from any suitable material. According to various embodiments,the second link 126 is fabricated from a thermoplastic material such as,for example, Delrin®.

The second link 126 includes a first portion 214 and a second portion216. The first portion 214 may be considered the proximal portion andthe second portion 216 may be considered the distal portion. The firstportion 214 may be fabricated integral with the second portion 216. Thefirst portion 214 has a generally cylindrical shaped exterior, andextends from the first end 208 of the second link 126 toward the secondend 210 of the second link 126. According to various embodiments, thediameter of the first portion 214 is on the order of approximately 4.80millimeters.

According to various embodiments, the second portion 216 has a generallycylindrically shaped exterior where it contacts the first portion 214,and tapers toward the second end 210 of the second link 126. Theexterior of the second portion 216 is configured in the form of agenerally segmented cone. According to various embodiments, the exteriorof the second portion 216 tapers from the first portion 214 to thesecond end 210 of the second link 126 at an angle on the order ofapproximately 20° relative to the exterior of the first portion 214. Thelength of the second link 126 may be on the order of approximately 15millimeters. However, one skilled in the art will appreciate that thelength of the second link 126 can vary based on the application.

The second link 126 also includes a first surface 218 that extends fromthe first end 208 of the second link 126 to the second end 210 of thesecond link 126, and a second surface 220 that extends from the firstend 208 of the second link 126 toward the second end 210 of the secondlink 126. The first surface 218 may be considered the outer surface ofthe second link 126, and the second surface 220 may be considered theinner surface of the second link 126.

The second link 126 also defines a first port 222, a second port 224,and a third port 226. (See FIG. 9B). The first port 222 extends from thesecond surface 220 to the first surface 218 and is substantiallyparallel to the longitudinal axis 212. The second port 224 extends fromthe second surface 220 to the first surface 218 and is substantiallyparallel to the longitudinal axis 212. The third port 226 extends fromthe second surface 220 to the first surface 218 and is substantiallyparallel to the longitudinal axis 212. The first, second and third ports222, 224, 226 may be cylindrical shaped and may be evenly spaced aboutthe longitudinal axis 212 of the second link 126 as shown in FIG. 9D.The size of each of the ports 222, 224, 226 may identical to one anotheror may be different from one another. For example, according to variousembodiments, the first and second ports 222, 224 are configured ascylinders having diameters on the order of approximately 1.50millimeters, and the third port 226 is configured as a cylinder having adiameter on the order of approximately 2.50 millimeters. The first,second and third ports 222, 224, 226 are each configured to receive andsurround any of a variety of tools or instruments (e.g., ablation tools)which may pass from the first end 24 of the multi-linked device 10 tothe second end 26 of the multi-linked device 10.

The second link 126 also defines a first through-hole 228, a secondthrough-hole 230, and a third through-hole 232. (See FIG. 9B). The firstthrough-hole 228 extends from the second surface 220 to the firstsurface 218 and is substantially parallel to the longitudinal axis 212.The second through-hole 230 extends from the second surface 220 to thefirst surface 218 and is substantially parallel to the longitudinal axis212. The third through-hole 232 extends from the second surface 220 tothe first surface 218 and is substantially parallel to the longitudinalaxis 212. The first, second and third through-holes 228, 230, 232 aregenerally cylindrically shaped. According to various embodiments, thethrough-holes 228, 230, 232 are evenly spaced from one another as shownin FIG. 9D. The size of each of the through-holes 228, 230, 232 may beidentical to one another or may be different from one another. Forexample, according to various embodiments, the respective diametersassociated with the through-holes 228, 230, 232 may each be on the orderof approximately 1.25 millimeters. The first through-hole 228 isconfigured to receive and surround the first cable 16. The secondthrough-hole 230 is configured to receive and surround the second cable18. The third through-hole 232 is configured to receive and surround thethird cable 20. As shown in FIG. 9D, each of the through-holes 228, 230,232 may comprise a respective counter-bored section 228 a, 230 a, 232 aat the distal end of the through-holes 228, 230, 232.

The second link 126 also defines a recess 234 that extends from thefirst end 208 toward the second end 210 along the longitudinal axis 212as shown in FIG. 9C. According to various embodiments, the recess 234 isgenerally configured as a complex shape that includes a combination of afirst segmented hemisphere 236 that extends from the first end 208toward the second end 210, and a second segmented hemisphere 238 thatextends from the first segmented hemisphere 236 toward the second end210 of the second link 126. According to various embodiments, the firstsegmented hemisphere 236 represents a portion of a sphere having adiameter on the order of approximately 9.50 millimeters, and secondsegmented hemisphere 238 represents a portion of a sphere having adiameter on the order of approximately 7.0 millimeters. The firstsegmented hemisphere 236 of the recess 234 is configured to receive thesecond end 162 of an intermediate link 128 when the intermediate link128 is coupled to the second link 126.

With the above described structure, an intermediate link 128 may becoupled to the second link 126 by seating the second end 162 of theintermediate link 128 in the first segmented hemisphere 236 of therecess 234 of the second link 126. As the convex configuration of thesecond end 162 of the intermediate link 128 generally corresponds withthe concave configuration of the first segmented hemisphere 236 of therecess 234 of the second link 126, the intermediate link 128 may becoupled to the second link 126 such that the longitudinal axis 164, thefirst, second and third grooves 174, 176, 178, and the first, second andthird through-holes 190, 192, 194 of the intermediate link 128 arerespectively aligned with the longitudinal axis 212, the first, secondand third ports 222, 224, 226, and the first, second and thirdthrough-holes 228, 230, 232 of the second link 126. The second link 126may be moved relative to the intermediate link 128 coupled thereto suchthat the respective longitudinal axes 164, 212 are not aligned.According to various embodiments, the configuration of the second link126 allows for an intermediate link 128 coupled thereto to be movedrelative to the second link 126 such that the respective longitudinalaxes 164, 212 are up to approximately 10° out of alignment with oneanother.

When the first mechanism 12 is inserted into the second mechanism 14,the first second and third grooves 70, 72, 74 of the intermediate links32 of the first mechanism 12 may be substantially aligned with thefirst, second and third grooves 174, 176, 178 of the intermediate links128 of the second mechanism 14, and the first, second and third grooves98, 100, 102 of the second link 30 of the first mechanism 12 may besubstantially aligned with the first, second and third ports 222, 224,226 of the second link 126 of the second mechanism 14. The combinationof the first grooves 70 of the intermediate links 32 of the firstmechanism 12 aligned with the first grooves 174 of the intermediatelinks 128 of the second mechanism 14 allows the respective first grooves70, 174 to collectively serve as a first working port that issubstantially aligned with the first port 222 of the second link 126 ofthe second mechanism 14. The first groove 70 may be considered the innerportion of the first working port and the first groove 174 may beconsidered the outer portion of the first working port.

Similarly, the combination of the second grooves 72 of the intermediatelinks 32 of the first mechanism 12 aligned with the second grooves 176of the intermediate links 128 of the second mechanism 14 allows therespective second grooves 72, 176 to collectively serve as a secondworking port that is substantially aligned with the second port 224 ofthe second link 126 of the second mechanism 14, and the combination ofthe third grooves 74 of the intermediate links 32 of the first mechanism12 aligned with the third grooves 178 of the intermediate links 128 ofthe second mechanism 14 allows the respective third grooves 74, 178 tocollectively serve as a third working port that is substantially alignedwith the third port 226 of the second link 126 of the second mechanism14. The second groove 72 may be considered the inner portion of thesecond working port and the second groove 176 may be considered theouter portion of the second working port. The third groove 74 may beconsidered the inner portion of the third working port and the thirdgroove 178 may be considered the outer portion of the third workingport. The first, second and third working ports may be utilized to passvarious tools or instruments (e.g., ablation tools) from the first end24 of the multi-linked device 10 to the second end 26 of themulti-linked device 10. For the exemplary sizes described hereinabove,the third working port is larger than the first and second workingports. Accordingly, the third working port may be utilized to carry aparticular tool or instrument that is too large to be carried by thefirst or second working ports.

When the respective grooves 70, 72, 74, 174, 176, 178 of the respectiveintermediate links 32, 128 are aligned and collectively surround thevarious tools and instruments, the combination of the grooves 70, 72,74, 174, 176, 178 and the tools and instruments may serve to limit orprevent the rotation of the first mechanism 12 relative to the secondmechanism 14.

As the diameter of the passage 180 of the intermediate link 128 of thesecond mechanism 14 is larger than the diameter of any portion of thefirst mechanism 12, a three-dimensional space 240 exists between thefirst mechanism 12 and the second mechanism 14 when the first mechanism12 is received by the second mechanism 14 (See FIG. 1B). According tovarious embodiments, the space 240 may be utilized to carry wiring,tools, instruments, etc. from the first end 24 of the multi-linkeddevice 10 toward the second end 26 of the multi-linked device 10.

The first, second and third cables 16, 18, 20 may be fabricated from anysuitable material. For example, according to various embodiments, thecables 16, 18, 20 may be fabricated from a polyethylene fiber cable suchas, for example, Spectra®. The cables 16, 18, 20 may be utilized tocontrol the movement of the multi-linked device 10. For example, byapplying a substantially equal tension to each of the cables 16, 8, 20,the first mechanism 12 and/or second mechanism 14 may be steered in adirection such that the respective longitudinal axes 38, 62, 90, 134,164, 212 of each of the links 28, 30, 32, 124, 126, 128 are all aligned.By applying a different tension to one or more of the cables 16, 18, 20,the first mechanism 12 and/or the second mechanism 14 may be steered ina direction such that the respective longitudinal axes 38, 62, 90, 134,164, 212 of each of the links 28, 30, 32, 124, 126, 128 are not allaligned. The cables 16, 18, 20 may also be utilized to control therelative state of the second mechanism 14. For example, when a uniformtension is applied to the cables 16, 18, 20, the second mechanism 14 isplaced in a “rigid” state, and when a tension is removed from the cables16, 18, 20, the second mechanism 14 is placed in a “limp” state.According to various embodiments, the cables 16, 18, 20 may be attachedat the first end 130 of the first link 124 of the second mechanism 14 torespective pullies (not shown) by, for example, respective stopperknots. The cables 16, 18, 20 may be attached to the second end 132 ofthe second link 126 of the second mechanism 14 by, for example,respective stopper knots positioned in the counter-bore sections 228 a,230 a, 232 a of the second link 126. One skilled in the art willappreciate that, according to other embodiments, the “rigid” and “limp”states may be achieved by subjecting the first and/or second mechanisms12, 14 to a twisting force, or by any other manner known in the art.

The fourth cable 22 may be fabricated from any suitable material. Forexample, according to various embodiments, the cable 22 may befabricated from a polyethylene fiber cable such as, for example,Spectra®. The fourth cable 22 may be utilized to control the relativestate of the first mechanism 12. For example, when the fourth cable 22is drawn tight, the first mechanism 12 is placed in a “rigid” state,whereas when the fourth cable 22 is let loose, the first mechanism 12 isplaced in a “limp” state. According to various embodiments, the fourthcable 22 may be attached at the first end 34 of the first link 28 of thefirst mechanism 12 to a pully (not shown) by, for example, a stopperknot. The fourth cable 22 may be attached to the second end 88 of thesecond link 30 of the first mechanism 12 by, for example, a stopperknot.

FIG. 10 illustrates various embodiments of a motion sequence of thesteerable multi-linked device 10. At the start of the sequence, thesecond mechanism 14 surrounds the first mechanism 12 as shown in step“a” of FIG. 10, the longitudinal axes 38, 62, 90 of the links 28, 30, 32of the first mechanism 12 are substantially aligned with the respectivelongitudinal axes 134, 164, 212 of the links 124, 126, 128 of the secondmechanism, and the second end 26 of the first mechanism 12 is atsubstantially the same position as the second end 122 of the secondmechanism 14. The fourth cable is pulled tight, thereby placing thefirst mechanism 12 in the rigid mode. The cables 16, 18, 20 are notpulled tight, thereby placing the second mechanism 14 in the limp mode.

The second mechanism 14 is then advanced so that its second link 126 ispositioned approximately one link ahead of the second end 24 of thefirst mechanism 12 as shown in step “b” of FIG. 10. The cables 16, 18,20 may be utilized to orient the second link 126 to a particularorientation, where the longitudinal axis 134 of the first link 124 is nolonger aligned with the longitudinal axes 164 of the intermediate links128 of the second mechanism 14 or the longitudinal axis 90 of the secondlink 30 of the first mechanism 12. After the second link 126 is in thedesired position and orientation, the cables 16, 18, 20 are pulled withidentical force in order to place the second mechanism 14 in the rigidmode, thereby preserving the position and orientation of the secondmechanism 14.

The pulling force of the fourth cable 22 is then released to place thefirst mechanism 12 the limp mode. After the first mechanism 12 is placedin the limp mode, the first mechanism 12 is advanced so that its secondlink 30 is at substantially the same position as the second end 122 ofthe second mechanism 14 as shown in step “c” of FIG. 10. After thesecond link 30 of the first mechanism 12 is in the desired position andorientation, the fourth cable 22 is pulled tight to place the firstmechanism 12 back in the rigid mode, thereby preserving the position andorientation of the first mechanism 12.

The pulling forces of the cables 16, 18, 20 are then released to placethe second mechanism 14 back in the limp mode. After the secondmechanism 14 is placed back in the limp mode, the second mechanism 14 isadvanced so that its second link 126 is once again positionedapproximately one link ahead of the second end 26 of the first mechanism12 as shown in step “d” of FIG. 10. After the second link 126 is in thedesired position and orientation, the cables 16, 18, 20 are pulled withidentical force in order to place the second mechanism 14 in the rigidmode, thereby preserving the position and orientation of the secondmechanism 14.

The pulling force of the fourth cable 22 is then released to place thefirst mechanism 12 back in the limp mode. After the first mechanism 12is placed back in the limp mode, the first mechanism 12 is advanced sothat its second link 30 is once again at substantially the same positionas the second end 122 of the second mechanism 14 as shown in step “e” ofFIG. 10. After the second link 30 of the first mechanism 12 is in thedesired position and orientation, the fourth cable 22 is pulled tight toplace the first mechanism 12 back in the rigid mode, thereby preservingthe position and orientation of the first mechanism 12. The generalmotion sequence described hereinabove, may be repeated any number oftimes, and the second link 126 of the second mechanism 14 may beadvancing in any direction and orientation. One skilled in the art willappreciate that any number of motion sequences may be utilized with themulti-linked device 10. For example, according to various embodiments,the second mechanism 14 may advance any number of links ahead of thefirst mechanism 12.

The exemplary sizes described hereinabove are generally relative to eachother, and one skilled in the art will appreciate that the multi-linkeddevice 10 can be scaled up or scaled down. For example, although thediameter at the largest portion of the intermediate link 128 of themulti-linked device 10 is on the order of approximately 9.65 millimetersfor the embodiments described hereinabove, one skilled in the art willappreciate that, for other embodiments, the intermediate link 128 can bescaled down such that the diameter at the largest portion of theintermediate link 128 of the multi-linked device 10 is on the order ofapproximately 1.0 millimeter. For such embodiments, each of the othercomponents of the multi-linked device 10 would also be proportionallyscaled down.

The combination of the unique configuration of the respective links 28,30, 32 which comprise the first mechanism 12 and the uniqueconfiguration of the respective links 124, 126, 128 which comprise thesecond mechanism 14 provides the multi-linked device 10 with the abilityto traverse a path defined by the circumference of a circle having arelatively small radius. For example, for the exemplary sizes describedhereinabove, the multi-linked device 10 can traverse a path defined bythe circumference of a circle having a radius on the order ofapproximately 40 millimeters. An example of the multi-linked device 10navigating such tight curvatures is shown in FIG. 11. For embodimentswhere the outer diameter of the multi-linked device 10 is on the orderof approximately 1.0 millimeter, the multi-linked device 10 can traversea path defined by the circumference of a circle having a radius on theorder of approximately 4.0 millimeters. Stated differently, themulti-linked device 10 can traverse a path defined by a circumference ofa circle having a radius which is approximately only four times theouter diameter of the device 10. One skilled in the art will appreciatethat the ability to navigate such tight curvatures makes themulti-linked device 10 suitable for use in a number of differentminimally invasive procedures, both in luminal spaces and in intracavityspaces.

FIG. 12 illustrates various embodiments of an apparatus 300 forpositioning a device 302. The device 302 may be any type of device whichcan be utilized for applications involving surgery, surveillance,inspection, etc. With respect to surgery applications, the device 302may comprise a feeder that may be utilized to insert or extract themulti-linked device 10 into or from a patient 304 positioned on anoperating table 306, and the apparatus 300 may be utilized to positionthe device 302 relative to the patient 304. For purposes of clarity, themulti-linked device 10 is not shown in FIG. 12. The apparatus 300includes a first arm 310 and a second arm 312. The second arm 312 iscoupled to the first arm 310 and to a support member 314 which isconnected to the device 302. The apparatus 300 has at least five degreesof freedom.

FIGS. 13A-13E illustrate various embodiments of an apparatus 400 forpositioning a device 402. The device 402 may be any type of device whichcan be utilized for applications involving surgery, surveillance,inspection, etc. With respect to surgery applications, the device 402may comprise a feeder that may be utilized to insert or extract themulti-linked device 10 into or from a patient positioned on an operatingtable, and the apparatus 400 may be utilized to position the device 402relative to the patient. For purposes of clarity, neither the patient,the operating table, nor the multi-linked device 10 are shown in FIGS.13A-13E, and the various components of the feeder 402 (e.g., motors,printed circuit boards, etc.) are not shown. As explained in more detailhereinbelow, the apparatus 400 has at least five degrees of freedom.

The apparatus 400 is structured and arranged such that the apparatus 400and the device 402 do not interfere with personnel working on thepatient. The apparatus 400 includes a first arm 410, a second arm 412, acoupling member 414, and a sloped support member 416.

The first arm 410 may be of any suitable size and shape. According tovarious embodiments, the first am 410 may have a cylindrical shape, arectangular shape, etc., and may have a length on the order ofapproximately three to four feet. The first arm 410 may be fabricatedfrom any suitable material. For example, according to variousembodiments, the first arm 410 is fabricated from a metal such as, forexample, aluminum. According to other embodiments, the first arm 410 isfabricated from a plastic. In various implementations, the first arm 410is coupled to an operating table in a manner similar to that shown inFIG. 12. The first arm 410 may be coupled to the operating table in anysuitable manner. For example, according to various embodiments, thefirst arm 410 may be coupled to the operating table via a bracketmounted to the operating table, via a universal mount, via a pivotjoint, etc. For embodiments where the first arm 410 is coupled to theoperating table via a pivot joint, the angle of the first arm 410relative to a top surface of the operating table may be varied eithermanually or by a control system. In other implementations, the first arm410 is mounted to a moveable base which is not connected to theoperating table.

The second arm 412 may be of any suitable size and shape. According tovarious embodiments, the second arm 412 may have a cylindrical shape, arectangular shape, etc. The second arm 412 may be fabricated from anysuitable material. For example, according to various embodiments, thesecond arm 412 is fabricated from a metal such as, for example,aluminum. According to other embodiments, the second arm 412 isfabricated from a plastic. The second arm 412 is coupled to the firstarm 410 via the coupling member 414. According to various embodiments,the second arm 412 includes a first portion 418 which is a fixed portionand a second portion 420 which is a movable (e.g., telescopic) portion.The second portion 420 is movable relative to the first portion 418. Theposition of the second portion 420 relative to the first portion 41 maybe varied either manually or by a control system. According to variousembodiments, a given position of the second portion 420 relative to thefirst portion 418 may be maintained by a fastener such as, for example,a set screw. According to other embodiments, the force of gravity mayserve to maintain the position of the second portion 420 relative to thefirst portion 418. According to yet other embodiments, a given positionof the second portion 420 relative to the first portion 418 may bemaintained by a motor. The second portion 420 may be extended andretracted relative to the first portion 418 such that the maximumeffective length of the second arm 412 is on the order of approximatelytwo feet and the minimum effective length of the second arm 412 is onthe order of approximately one foot.

According to various embodiments, as shown in FIG. 14A, the outersurface of the second portion 420 may define a keyway 422, and the innersurface of the first portion 418 may define a protrusion 424 structuredand arranged to be received by the keyway 422. According to otherembodiments, as shown in FIG. 14B, the inner surface of the firstportion 418 may define a keyway 426, and the outer surface of the secondportion 420 may define a protrusion 428 structured and arranged to bereceived by the keyway 426. Such arrangements may serve to prevent thefirst and second portions 418, 420 from rotating with respect to oneanother.

Returning to FIG. 13A, the second arm 412 may also include a ball 430connected to the movable portion 420 of the second arm 412, and a socket432 coupled to the ball 430. A simplified representation of the ball 430and socket 432 is shown in FIG. 15. The ball 430 may be fabricated fromany suitable material. For example, according to various embodiments,the ball 430 is fabricated from a metal such as, for example, aluminum.According to various embodiments, the ball 430 may be formed integralwith the movable portion 420 of the second arm 412. The socket 432 maybe fabricated from any suitable material. For example, according tovarious embodiments, the socket 432 may be fabricated from a plastic.According to various embodiments, the ball 430 and socket 432 cooperateto provide three degrees of freedom (e.g., pitch, yaw, and roll).According to other embodiments, the socket 432 is a constrained socket,and the ball 430 and socket 432 cooperate to provide at least twodegrees of freedom.

The coupling member 414 defines a first opening 434 and a second opening436. The first opening 434 is sized to receive the first arm 410 whichpasses therethrough, and the second opening 436 is sized to receive thesecond arm 412 which therethrough. According to various embodiments, thefirst and second openings 434, 436 are oriented approximately 90°relative to one another. The coupling member 414 may be fabricated fromany suitable material. For example, according to various embodiments,the coupling member 414 is fabricated from a metal such as, for example,aluminum. According to other embodiments, the coupling member 414 isfabricated from a plastic. According to various embodiments, thecoupling member 414 may be removably secured to the first arm 410 by,for example, a fastener such as, for example, a set screw. According tovarious embodiments, a given position of the coupling member 414relative to the first arm 410 may be maintained by a motor.

The coupling member 414 may be rotatably connected to the first arm 410such that the coupling member 414 may be rotated up to 360° about thefirst arm 410. Such rotation also operates to rotate the second arm 412about the first arm 410. The coupling member 414 may also be slidablyconnected to the first arm 410 such that the coupling member 414 maymoved up and down along the first arm 410 as shown, for example, inFIGS. 13A and 13D. Such vertical movement also operates to move thesecond arm 412 along the length of the first arm 410. The rotationaland/or vertical motion of the coupling member 414 relative to the firstarm 410 may be realized manually or by a control system.

According to various embodiments, the apparatus 400 may further comprisea sleeve or bushing 438 positioned in the first opening 434 of thecoupling member 414 as shown in FIG. 16. For such embodiments, the firstarm 410 passes through an opening 440 defined by the bushing 438, andboth the bushing 438 and the coupling member 414 are rotatable about thefirst arm 410 and are slidable along the first arm 410. According tovarious embodiments, the coupling member 414 and the bushing 438 arekeyed together. For such embodiments, the coupling member 414 and thebushing 438 may be keyed together in a manner similar to the manner inwhich the first and second portions 418, 420 of the second arm 412 arekeyed together as shown in either FIG. 14A or FIG. 14B.

The position of the second arm 412 relative to the coupling member 414may be fixed, or may be varied either manually or by a control system.According to various embodiments, the coupling member 414 may beremovably secured to the second arm 412 by, for example, a fastener suchas, for example, a set screw. According to other embodiments, a givenposition of the coupling member 414 relative to the second arm 412 maybe maintained by a motor. According to various embodiments, the couplingmember 414 and the second arm 412 are keyed together. For suchembodiments, the coupling member 414 and the fixed portion 418 of thesecond arm 412 may be keyed together in a manner similar to the mannerin which the first and second portions 418, 420 of the second arm 412are keyed together as shown in either FIG. 14A or FIG. 14B. Such anarrangement may serve to prevent the fixed portion 418 of the second arm412 from rotating with respect to the coupling member 414.

According to various embodiments, each of the first and second arms 410,412 define hollow areas therein, and power wiring and/or control wiringmay pass through the hollow areas. Such wiring may be utilized for theapparatus 400 and/or the feeder 402.

The sloped support member 416 is releasably connected to the second arm412. In general, the releasable connection may be realized in anysuitable manner. For example, according to various embodiments, thereleasable connection is realized by a protrusion of the sloped supportmember 416 cooperating with a receptacle defined by an end of the secondarm 412 as shown, for example, in FIG. 15. According to otherembodiments, the releasable connection is realized by a protrusion at anend of the second arm 412 cooperating with a receptacle defined by thesloped support member 416. Such protrusion/receptacle combinations maybe considered to be a quick release mechanism due to the relative speedand ease with which the sloped support member 416 can be connected to ordisconnected from the second arm 412. As shown in FIG. 13A, the slopedsupport member 416 may define an angle of approximately 45° relative toa bottom surface of the sloped support member 416. When combined withthe functionality of the ball 430 and socket 432, the 45° angle orientsa feeder 402 positioned on the sloped support member 416 in anorientation that is useful for minimally invasive surgery over theentire range of motion of the apparatus 400. For other applications, thesloped support member 416 may define an angle that is more than or lessthan 45° relative to the bottom surface of the sloped support member416.

As shown in FIGS. 13A-13E, the structure and arrangement of the ball 430and socket 432 allows the sloped support member 416 to be moved relativeto the movable (e.g., telescopic) portion 420 of the second arm 412.Such movement may be controlled either manually or by a control system.According to various embodiments, the structure and arrangement of theball 430 and socket 432 allows for pitch and yaw control of the slopedsupport member 416. For example, as shown in FIGS. 13A-13C, the range ofmotion about a vertical axis of the movable portion 420 (e.g., yaw) mayvary over a range of approximately 180° (+/−90°), and, as shown in FIGS.13D-13F, the range of motion about a lateral axis of the movable portion420 (e.g., pitch) may vary over a range of approximately 40° (+/−20°).According to other embodiments, the structure and arrangement of theball 430 and socket 432 may also allow for roll control of the slopedsupport member 416 about a longitudinal axis of the movable portion 420.As the feeder 402 may be connected to the device support member 416, theball 430 and socket 432 also allows for pitch and yaw control (and insome embodiments, roll control) of the feeder 402 that may be utilizedto insert or extract a multi-linked device 10 into or from a patient.

As described hereinabove, the apparatus 400 may be considered to be aseries of serial mechanisms, with each serial mechanism operable toprovide a certain number of degrees of freedom. However, those skilledin the art will appreciate that, according to other embodiments, thedescribed functionality of the apparatus 400 may also be realized byreplacing at least one of the serial mechanisms with a parallelmechanism. For example, according to various embodiments, the ball 430and socket 432 may be replaced with a parallel mechanism.

While several embodiments of the invention have been described herein byway of example, those skilled in the art will appreciate that variousmodifications, alterations, and adaptions to the described embodimentsmay be realized without departing from the spirit and scope of theinvention defined by the appended claims.

1. An apparatus for positioning a device, the apparatus comprising: acoupling member, wherein the coupling member defines a first opening anda second opening; a first arm which passes through the first opening,wherein the coupling member is movably connected to the first arm; asecond arm which passes through the second opening; and a sloped supportmember releasably connected to the second arm, wherein the slopedsupport member defines a protrusion, wherein the second arm defines areceptacle configured to receive the protrusion, wherein the apparatushas at least five degrees of freedom, wherein a position of one or moreof the first arm and coupling member and second arm and coupling memberis maintained by a motor.
 2. The apparatus of claim 1, wherein thecoupling member is rotatably connected to the first arm.
 3. Theapparatus of claim 1, wherein the coupling member is slidably connectedto the first arm.
 4. The apparatus of claim 1, wherein the couplingmember is rotatably and slidably connected to the first arm.
 5. Theapparatus of claim 1, wherein: the apparatus further comprises a bushingpositioned in the first opening; and the first arm passes through anopening defined by the bushing.
 6. The apparatus of claim 1, wherein thecoupling member and the bushing are keyed together.
 7. The apparatus ofclaim 1, wherein the coupling member is removably secured to at leastone of the first and second arms.
 8. The apparatus of claim 1, whereinthe coupling member and the second arm are keyed together.
 9. Theapparatus of claim 1, wherein the second arm comprises: a first portion;and a second portion which is extendable relative to the first portion.10. The apparatus of claim 9, wherein the coupling member and the firstportion are keyed together.
 11. The apparatus of claim 9, wherein thefirst portion and the second portion are keyed together.
 12. Theapparatus of claim 9, wherein the second arm further comprises: a ballconnected to the second portion of the second arm; and a socket coupledto the ball.
 13. The apparatus of claim 12, wherein the socket is aconstrained socket.
 14. The apparatus of claim 1, wherein the slopedsupport member is coupled to the second arm such that the sloped supportmember is movable relative to the second arm about at least two of thefollowing: a lateral axis of the second arm; a vertical axis of thesecond arm; and a longitudinal axis of the second arm.
 15. The apparatusof claim 1, wherein the second arm and the sloped support membercollectively form a quick release mechanism.
 16. The apparatus of claim1, wherein a top surface of the sloped support member is configured tosupport a feeder mechanism.
 17. An apparatus for positioning a device,the apparatus comprising: a coupling member, wherein the coupling memberdefines a first opening and a second opening; a first arm which passesthrough the first opening, wherein the coupling member is movablyconnected to the first arm; a second arm which passes through the secondopening; and a sloped support member releasably connected to the secondarm, wherein the second arm defines a protrusion, wherein the slopedsupport member defines a receptacle configured to receive theprotrusion, wherein the apparatus has at least five degrees of freedom.18. An apparatus for positioning a device, the apparatus comprising: acoupling member, wherein the coupling member defines a first opening anda second opening; a first arm which passes through the first opening,wherein the coupling member is movably connected to the first arm; asecond arm which passes through the second opening, wherein the secondarm comprises a fixed portion and a moveable portion, wherein themoveable portion is extendable relative to the fixed portion, wherein aninner surface of the fixed portion defines a first protrusion, whereinan outer surface of the moveable portion defines a keyway configured toreceive the first protrusion; a ball connected to the moveable portion;a socket coupled to the ball, wherein the socket defines a receptacle; asloped support member that defines a second protrusion, wherein thereceptacle is configured to receive the second protrusion, wherein thesloped support member comprises a top surface configured to support afeeder mechanism.